CN215118828U - Micro-channel plate-based time-of-flight mass spectrometer detector - Google Patents
Micro-channel plate-based time-of-flight mass spectrometer detector Download PDFInfo
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- CN215118828U CN215118828U CN202121251288.1U CN202121251288U CN215118828U CN 215118828 U CN215118828 U CN 215118828U CN 202121251288 U CN202121251288 U CN 202121251288U CN 215118828 U CN215118828 U CN 215118828U
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Abstract
The utility model discloses a time of flight mass spectrometer detector based on microchannel plate, including first splint, second splint, first microchannel plate, second microchannel plate and differential pressure circuit, differential pressure circuit includes differential pressure power supply, anode plate and polylith negative electrode board, it has first electrode board to fill up between first splint and the first microchannel plate, it has the second electrode board to fill up between first microchannel plate and the second microchannel plate, it has the third electrode board to fill up between second microchannel plate and the second splint, the below of second splint is equipped with preamplifier, it is fixed through the bolt nut between first splint, second splint, first microchannel plate and the second microchannel plate. The utility model discloses through twice microchannel plate amplification, the electron number of production is hundreds of times of the original ion that gets into, again through preamplifier enlargies the back, and ionic signal is changed after enlargiing and is gathered by data acquisition card, and the magnification of the electron of detector is high to guarantee that collection sensitivity is high.
Description
Technical Field
The utility model relates to a mass spectrometer detector technical field especially relates to a time of flight mass spectrometer detector based on microchannel plate.
Background
The micro-channel plate is adopted to detect and expand flying ions, and is a main technology for detecting the sizes of the ions by the existing mass spectrometer. However, the number of times that ions collide in the microchannel represents that more electrons are generated, and the more electrons are, the more easily detected, so that the sensitivity of the detector is determined by the number of times that the microchannel plate collides with the ions to generate the electrons. Then, the electric signals are collected through a special preamplifier and a data acquisition card, and subsequent analysis is carried out. The sensitivity of the detector of a mass spectrometer therefore depends on how many times the electrons are magnified.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, an object of the utility model is to provide a time of flight mass spectrometer detector based on microchannel plate, solved the not high problem of detector sensitivity of existing mass spectrometer.
According to the utility model provides a time of flight mass spectrometer detector based on microchannel plate, including first splint, second splint, first microchannel plate, second microchannel plate and differential pressure circuit, differential pressure circuit includes differential pressure power, anode plate and polylith negative electrode board, it has first electrode board to fill up between first splint and the first microchannel plate, it has the second electrode board to fill up between first microchannel plate and the second microchannel plate, it has the third electrode board to fill up between second microchannel plate and the second splint, the below of second splint is equipped with preamplifier, it is fixed through the bolt nut between first splint, second splint, first microchannel plate and the second microchannel plate.
In some embodiments of the present invention, the differential voltage circuit further includes a first voltage-dividing resistor and a second voltage-dividing resistor, the differential voltage power supply, the anode plate, the first voltage-dividing resistor and the second voltage-dividing resistor are sequentially connected in series, the first electrode plate is electrically connected to the wire between the anode plate and the first voltage-dividing resistor, the second electrode plate is electrically connected to the wire between the first voltage-dividing resistor and the second voltage-dividing resistor, and the third electrode plate is electrically connected to the wire between the second voltage-dividing resistor and the negative electrode of the differential voltage power supply.
In other embodiments of the present invention, the first microchannel plate and the second microchannel plate have the same structure and are all provided with a circular microchannel region in the middle, the first clamping plate is provided with an ion inlet in the middle, the second clamping plate is provided with an ion outlet in the middle, the ion inlet is slightly smaller than the circular microchannel region, and the ion outlet is slightly larger than the circular microchannel region.
In other embodiments of the present invention, the circular microchannel region has a plurality of microchannels therein, and the microchannels are tapered from the ion entrance end to the ion exit end.
In other embodiments of the present invention, four bolt holes are disposed on the first clamping plate, the second clamping plate, the first microchannel plate and the second microchannel plate, and are matched with each other, and the bolt is just inserted into the bolt hole.
The utility model discloses in, set up two microchannel plates, the ion source is the sample ionization back in the mass spectrograph, fly to the microchannel of the microchannel plate in the detector in, the striking produces the electron, the electron is strikeed the microchannel pore wall once more after being accelerated, thereby produce more secondary electrons, and enlarge the processing through twice microchannel plate, the electron number of production is hundreds of times of the original ion that gets into, again through preamplifier enlargies the back, ion signal is changed after enlarging and is gathered by data acquisition card, the magnification of the electron of detector is high, it is high to guarantee to gather sensitivity.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a detector of a time-of-flight mass spectrometer based on a microchannel plate.
Fig. 2 is a schematic structural diagram of a microchannel plate according to the present invention.
Fig. 3 is a schematic cross-sectional view of a microchannel of the microchannel plate according to the present invention.
Fig. 4 is a schematic structural diagram of the first electrode plate provided by the present invention.
In the figure: 1. a first splint; 11. an ion inlet; 2. a second splint; 21. an ion outlet; 3. a first microchannel plate; 4. a second microchannel plate; 5. a first electrode plate; 6. a second electrode plate; 7. a third electrode plate; 8. a bolt; 9. a differential voltage power supply; 90. an anode plate; 91. a first voltage dividing resistor; 92. a second voltage dividing resistor; 10. a preamplifier; 30, 50, bolt holes.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
Referring to fig. 1-4, a detector of a time-of-flight mass spectrometer based on a microchannel plate comprises a first clamping plate 1, a second clamping plate 2, a first microchannel plate 3, a second microchannel plate 4 and a differential pressure circuit, wherein the differential pressure circuit comprises a differential pressure power supply 9, an anode plate 90 and a plurality of cathode electrode plates, a first electrode plate 5 is padded between the first clamping plate 1 and the first microchannel plate 3, a second electrode plate 6 is padded between the first microchannel plate 3 and the second microchannel plate 4, a third electrode plate 7 is padded between the second microchannel plate 4 and the second clamping plate 2, a preamplifier 10 is arranged below the second clamping plate 2, and the first clamping plate 1, the second clamping plate 2, the first microchannel plate 3 and the second microchannel plate 4 are fixed through bolts 8 and nuts.
When ions fly to the detector from the inside of the aircraft, the ions firstly enter from the first clamping plate 1 and sequentially pass through the first microchannel plate 3 and the second microchannel plate 4, when the ions pass through, the ions impact the wall of the microchannel 31 to generate more secondary electrons, the electrons impact again to generate more electrons, and the number of the electrons after the electrons come out from the second microchannel plate 4 is hundreds of times of that of the incident ions. The number of ions is effectively enlarged, and the ions are amplified by the preamplifier 10 and then collected by the data acquisition card. The detector has high amplification factor and high detection sensitivity. And the negative pressure difference among the first electrode plate 5, the second electrode plate 6 and the third electrode plate 7 is different, so that the pressure difference is generated on two sides of each microchannel plate, and the electrons can be accelerated to fly out of the microchannel 31 again.
The differential voltage circuit further comprises a first voltage-dividing resistor 91 and a second voltage-dividing resistor 92, the differential voltage power supply 9, the anode plate 90, the first voltage-dividing resistor 91 and the second voltage-dividing resistor 92 are sequentially connected in series, the first electrode plate 5 is electrically connected to a lead between the anode plate 90 and the first voltage-dividing resistor 91, the second electrode plate 6 is electrically connected to a lead between the first voltage-dividing resistor 91 and the second voltage-dividing resistor 92, and the third electrode plate 7 is electrically connected to a lead between the second voltage-dividing resistor 92 and the negative electrode of the differential voltage power supply 9.
The anode plate 90 is a high potential of the circuit, and the voltages at both sides of the first voltage-dividing resistor 91 and the second voltage-dividing resistor 92 are negative voltages, so that the first electrode plate 5, the second electrode plate 6 and the third electrode plate 7 are all negative voltages, and a pressure difference is formed at both sides of the microchannel plate. The negative pressure is gradually reduced to ensure that the electrons fly out of the microchannel plate.
The first microchannel plate 3 and the second microchannel plate 4 have the same structure, a circular microchannel area is arranged in the middle of each of the first microchannel plate and the second microchannel plate, an ion inlet 11 is arranged in the middle of the first clamping plate 1, an ion outlet 21 is arranged in the middle of the second clamping plate 2, the size of the ion inlet 11 is slightly smaller than that of the circular microchannel area, and the size of the ion outlet 21 is slightly larger than that of the circular microchannel area.
Because the ions enter the microchannel 31 at different angles, in order to ensure that the incident ions completely enter the circular microchannel region of the microchannel plate, the size of the ion inlet 11 needs to be slightly smaller than the circular microchannel region, and in order to ensure that all electrons can be emitted, the size of the ion outlet 21 needs to be slightly larger than the circular microchannel region.
The circular microchannel region is provided with a plurality of microchannels 31, and the microchannels 31 are gradually thinned from the ion inlet end to the ion outlet end. Increasing the number of times ions and electrons impact the walls of the microchannel 31.
The first clamping plate 1, the second clamping plate 2, the first microchannel plate 3 and the second microchannel plate 4 are respectively provided with four bolt holes 30 and 50 which are matched with each other, and the bolts 8 are just inserted into the bolt holes 30 and 50. The four bolt holes 30 and 50 are respectively arranged at four positions, so that the fixation is firmer.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (5)
1. A time-of-flight mass spectrometer detector based on a microchannel plate, comprising: including first splint (1), second splint (2), first microchannel plate (3), second microchannel plate (4) and pressure differential circuit, pressure differential circuit includes pressure differential power supply (9), anode plate (90) and polylith negative electrode board, first electrode board (5) have been filled up between first splint (1) and first microchannel plate (3), second electrode board (6) have been filled up between first microchannel plate (3) and second microchannel plate (4), third electrode board (7) have been filled up between second microchannel plate (4) and second splint (2), the below of second splint (2) is equipped with preamplifier (10), fix through bolt (8) nut between first splint (1), second splint (2), first microchannel plate (3) and second microchannel plate (4).
2. A microchannel plate based time-of-flight mass spectrometer detector as claimed in claim 1 wherein: the differential pressure circuit further comprises a first voltage-dividing resistor (91) and a second voltage-dividing resistor (92), the differential pressure power supply (9), the anode plate (90), the first voltage-dividing resistor (91) and the second voltage-dividing resistor (92) are sequentially connected in series, the first electrode plate (5) is electrically connected to a lead between the anode plate (90) and the first voltage-dividing resistor (91), the second electrode plate (6) is electrically connected to a lead between the first voltage-dividing resistor (91) and the second voltage-dividing resistor (92), and the third electrode plate (7) is electrically connected to a lead between the second voltage-dividing resistor (92) and the negative pole of the differential pressure power supply (9).
3. A microchannel plate based time-of-flight mass spectrometer detector as claimed in claim 1 wherein: the structure of the first microchannel plate (3) is the same as that of the second microchannel plate (4), a circular microchannel area is arranged in the middle of the first microchannel plate, an ion inlet (11) is arranged in the middle of the first clamping plate (1), an ion outlet (21) is arranged in the middle of the second clamping plate (2), the size of the ion inlet (11) is slightly smaller than that of the circular microchannel area, and the size of the ion outlet (21) is slightly larger than that of the circular microchannel area.
4. A microchannel plate based time-of-flight mass spectrometer detector as claimed in claim 3 wherein: a plurality of micro-channels (31) are arranged in the circular micro-channel area, and the micro-channels (31) are gradually thinned from the ion inlet end to the ion outlet end.
5. A microchannel plate based time-of-flight mass spectrometer detector as claimed in claim 1 wherein: all be equipped with four bolt holes (30, 50) on first splint (1), second splint (2), first microchannel plate (3) and second microchannel plate (4), and match each other, bolt (8) just insert in bolt hole (30, 50).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121251288.1U CN215118828U (en) | 2021-06-04 | 2021-06-04 | Micro-channel plate-based time-of-flight mass spectrometer detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121251288.1U CN215118828U (en) | 2021-06-04 | 2021-06-04 | Micro-channel plate-based time-of-flight mass spectrometer detector |
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| Publication Number | Publication Date |
|---|---|
| CN215118828U true CN215118828U (en) | 2021-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121251288.1U Active CN215118828U (en) | 2021-06-04 | 2021-06-04 | Micro-channel plate-based time-of-flight mass spectrometer detector |
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| CN (1) | CN215118828U (en) |
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2021
- 2021-06-04 CN CN202121251288.1U patent/CN215118828U/en active Active
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Effective date of registration: 20221202 Address after: No. 21 and 23, Floor 5, Block A, Building 1, No. 1480, North Section of Tianfu Avenue, High tech Zone, Chengdu, Sichuan 610095 Patentee after: Chengdu Tailai medical laboratory Co.,Ltd. Address before: 19d, Guomao commercial and residential building, 3009 nanhu road, Nanhu street, Luohu District, Shenzhen, Guangdong 518000 Patentee before: Shenzhen Tailai Biotechnology Co.,Ltd. |
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